class_docstr: A placeholder used to specify a log-likelihood for a scan sub-graph.
code: def __str__(self):
      return f"Measurable({super().__str__()})"
  
imports: from copy import copy
  from typing import Callable, Dict, Iterable, List, Optional, Tuple, cast
  import numpy
  import pytensor
  import pytensor.tensor
  from pytensor.graph.basic import Variable
  from pytensor.graph.op import compute_test_value
  from pytensor.graph.rewriting.basic import node_rewriter
  from pytensor.graph.rewriting.db import RewriteDatabaseQuery
  from pytensor.scan.op import Scan
  from pytensor.scan.rewriting import scan_eqopt1, scan_eqopt2
  from pytensor.scan.utils import ScanArgs
  from pytensor.tensor.random.type import RandomType
  from pytensor.tensor.subtensor import Subtensor, indices_from_subtensor
  from pytensor.tensor.variable import TensorVariable
  from pytensor.updates import OrderedUpdates
  from pymc.logprob.abstract import MeasurableVariable, _logprob
  from pymc.logprob.basic import conditional_logp
  from pymc.logprob.rewriting import PreserveRVMappings, construct_ir_fgraph, inc_subtensor_ops, logprob_rewrites_db, measurable_ir_rewrites_db
  from pymc.logprob.utils import replace_rvs_by_values
label_desc: Use image node_id 1 for calling the MeasurableScan obj's underlying member method code with example usage: obj.__str__() and returns: str, super, str